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Re: My 2001 GMC Jimmy is stuck in 4 Lo.
I believe those are vacuum controlled on top of the transfer case is a plug with 3-4 vacuum lines going to it,you will need to take it out and see if the check ball is stuck if it is it needs to be replaced
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Sorry, but three possibilities. Most likely the 4wd actuator motor on the transfer case went bad. This is pretty common. They also encounter switch problems, but it sounds like your switch is doing what it's supposed to. One more thing, there is a 4wd control module, usually in the right kick panel. I'm betting on the shift motor though.
My GMC Jimmy '01 would slip from 2-wheel to 4-wheel drive while I was driving. First time it happened my mechanic replaced a small part. This last time, he couldn't find anything wrong so he popped the 2-4 out and disconnected the 4-wheel drive. Now I don't have the problem.
While you have a helper try to shift to 4x4, get under the truck and tap the shift motor with a mallet.Sometimes the shift motors stick if they haven't been used in a while. If this doesn't work you might have to replace the transfer case shift motor.
Usually when a truck gets stuck in 4 low you need to put it in reverse, start backing up very slowly, put it in neutral (or push in the clutch on manual trans models) and stop the truck with the brakes. this will release the load on the gearing which should allow you to shift out of 4 low.
It should tell you on the Shifter whether or not that you can Shift on the Fly. Check the Manual first if there is one in the Truck. Some Models had this and some Did not. Was an Extra from Factory Option.
I had a very similar problem with my 98 gmc 2500. The 4 low would engage - though the upshifts were erratic, but no 4 high though the light sometimes came on. I changed out the electric shift solenoid or whatever it is called, on the transfer case and it worked fine after that. A fairly simple fix that can be done in 15 minutes. Hope this helps.